Projecting-lamp.



C. A. & A. C. MATISSE.

PROJEGTING LAMP.

APPLICATION FILED DEC. 9, 1913.

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PROJEOTING LAMP.

APPLICATION FILED DEC. 9, 101:

Patented Sept. 15, 1914.

2 SHEBTS-SHEET 2.

mwwsu Ill/VE/VTOHS mum WITNESSES UNITED STATES PATENT OFFICE.

CABLE A. MA'IISSE ANDALBEBT C. MA'IISSE, OF NEW YORK, Ni Y.

PBOJECTING-LAMP.

Specification of Letters Patent.

Patented Sept; 15,1914.

Application filed December 9, 1918. Serial No. 805,654.

To all whom it may concern Be it known that we, CABLE A. MAT'ISSE and ALBERT C. MATISSE, citizens of the United States, and residents of the city of NewXork, New Brighton, borough of Richmond, in the county of Richmond and State of New York, have invented a new and Improved Project-ing-Lamp, of which the following is a full, clear, and exact description.

Our invention relates to projecting lamps on vehicles for road illumination, and has reference more particularly to the .type of lamp using a mirror lens.

An object thereof is to provide a simple, inexpensive and efficient lamp.

A further object of the invention is to provide a lamp of small depth andweight having two distinct brilliant fields of light without the use of a condenser, which not only reduce the bulkiness of thelamp but increase the lighting capacity of the same,

as no light is absorbed by the condenser.

A further object of the invention is to provide a lamp wherein one of the distinct fields of light can be eliminated when the same is'in use in cities.

We obtain the above objects by providing a lamp having a mirror lens, the reflecting surface of which has the shape of aparaboloid with a source of light positioned sub-H the said reflecting structure of the same.

Before proceeding to a more detailed descri tion of my invention, it must be clearly und e rsto od thatwhile the lam herein described is provided with an e ectric light the same can be used with any suitable light,

as acetylene, for example, in which case the front of the lamp can be provided with a glass cover, and the means for eliminating the powerful, substantially parallel oeam of light can be accomplished in different-ways. Referring to the drawings, 5 represents a lens the concave surface6 of which is a part of a spheroid, while the convex surface 7 of the same is a portion of a paraboloid, which surface is coated with a suitable composition 8 to form a reflector from the said surface through said lens, thereby formin substantially a mirror lens, of which the reflecting surface of the mirror has the surface of a paraboloid, while the surface on which the light falls is that of a spheroid.

The lens 5 fits with its convex surface 7 against the back of the lamp frame 9, which 1S carried by a mm 10 also forming a portion of the lamp frame, said rim having acircular extension 11, of any suitable design, forming the front of the lam a portion of which is the continuation of t e concave surface of the lens 5. Positioned in the focus of the paraboloid is which a light 12 falling on to substantially a lamp from the concave surface 6 of the lens is reflected by the convex surface of thelens forming the reflector,

The line w-y represents the axis of the lens on which lies the center 0 of the concave surface and the focus 1 of the convex surface. The points a and a, b and b, d and d and e and e are symmetrical with the axis w3 and represent the centers of curvature for parts of the paraboloid between the points 6'. b, b d and d e respectively.

A ray from the light 12 traveling in the direction of the axis w-y will be reflected by said lens in the same direction wy without any refraction. The other rays, falling on the concave surface 6 of the lens when entering the same, will be refracted toward the axis wg in view of the fact that the density of the glass is higher than that of air. By tracing the ray R, as shown in the drawings, it will be seen that as the ray from the lamp deviates from the exists-w, the reflected ray 1' deviates from the axis w-fy until a point isreached, when it begins to return toward the .axis As will be seen from the drawings, by the traced rays R and the reflected .rays r the rays falling on the portion 6' 'b' of the reflector deviate very rapidly-from the axis w-y, but from the point b toward the point e the rays rapidly rectify and become more and more arallel to the axis w-y.

The portionb' b of the lens and its reflcct-' use, as it illuminates not onlytlie front but by the surface at w-g; While the seen, due to the sides of the road for about one hundred feet ahead of the lamp. The portion 12' b of the convex surface 7 in combination with the lens 5 reflects the rays so as to bring them more and more parallel to the axis portions of, the reflecting surface from (1' to c, in combination with the lens 5, reflect the rays R from the light substantially parallel to the axis w-3 as can be seen from the drawings. The total reflecting surface d 6 being larger than that formed by b I), the quantity of the substantially parallel rays of light reflected by the surface d e is considerably larger than that reflected by the portion 1)" 7), and, therefore, the illumination obtained by the reflection of the surface d e is more intense than that obtained by b b. The portion of the reflected surface I) (5 makes a gradual connection between the two beams of light above described and not only adds tothe illumination of the road but forms, so' to speak, a diffuser from the rays substantially parallel to the axis w-ay to the rays angular to the said axis.

The strong parallel beam of light formed 6 must be intercepted when the said lamp is used for the illumination of city streets, and this we obtain by providing a spherical mirror.13 which is so mounted on the stem 14 carrying the lamp that the center of said mirror is in the center of the bulb, that is, in the focus of the concave surface. This mirror is rotatably mounted on the stem 14: and is controllable from the seat of the driver by means of a flexible connection 15. When the lamp is used on country roads the mirror is positioned as shown in the drawings in full lines, and the rays falling on the same are reflected to the concave surface of the lens thereby aiding the illumination of the concave surface by the light 12. When the lamp is used on city streets, the mirror 13 is placed in the position shown in dotted lines in the drawings by means of the flexible connection 15, thereby intercepting the rays from the light on to the concave surface of the lens 5 and reflecting the same. To make the light from said mirror more diffused, a lens 5 and reflecting the same. To make the light from said mirror more diffused, a screen 16 is positioned in front of the light, as shown in the drawings, and through which the rays reflected by themirror 13' have to pass. This screen or diffuser 16 is preferably made of nently fixed to the stem 14 of the bulb carrier. Normally, when the mirror is'in position shown in full lines in the drawings, the screen 16 in front of the mirror 13 is not the interference of rays. in the beam of .li ht produced by the lens 5 and the glarin c act of said lens.

As s .own in lg. 2, the elimination of the yellow glass and permaintense beam of parallel rays 'i's obtained by an axial movement of the lightfl2 iirwhich' case the stem 14 is positioned iirthe axis of the lens and is threaded on its extremity and engaged therein by a worm wheel 17 which is engaged by a worm 18 controllab atthe lamp, or, if desired, from the any" By moving the said light'12 toward the lens, the parallel rays are con\ t*d into rays angular with respect to the? by increasing the number of a gula effective at a'short distance froin From the above description seen-that in our lamp, by'pr? ror lens of which the reflecting the shape of a paraboloid, we d the commonly used condenser two distinct fields of light; only increase the illuminatiii lamp butreduce its weight and price, a 1 7 ing the same more compact. 'Tl'ie provision whereby the intense beam '1 clips (l s can be eliminated permits ""tl'l lamp as effectively on city str country roads. The provision tional concave mirror for utilizingt-lie""-a of light normally not directed ene li ror lens, increases further the 111 ino's the lens; and the provision 'o f th coacting with the concave mirro use of said lamps in cities where t nance forbids the use of glaring l-igh It is evident that various changes made and modifications resorted toi I construction and arrangement of -the'parts described without departing froiri 'the, pirit and scope of our invention; hence;ewe do not wish to limit ourselves otheiexac construction shown. Having thus describedour iii've tion, claim as new and desire to see b f Letters Patent: 5

1. In a projecting lam v exo concave lens'having theconvex "raeeicrmed -z into a reflector, said convex urfac'eb ng 'a part of a paraboloid and eta ce that of a spheroid. M 2. In a projecting a 'coiicavo convex mirror lens the convexsiiifiice v i'ch is generated bya par bola, and the e nerve surface by a circle, lens forming the inir ing in thickness fror'iit riphery. 3. In a proje ti a source of ligh Hereby the rays substantially parallel to the axis of the mirror lens can be eliminated.

4. In a projecting lamp, a mirror lens having a paraboloidal reflecting surface; a concave mirror axial with said mirror lamp and facing the same; a source oflight positioned intermediate said mirror lens and concave mirror and substantially in the focus of said reflecting surface of said mirror lens; and means for moving said concave mirror between said source of light and said mirror lens whereby the rays from said source of light to said mirror lens are intercepted by said concave mirror.

5. In a projecting lamp, a mirror lens having a paraboloidal reflecting surface; a

- concave mirror axial with said mirror lens and facing the same; a source of light positioned intermediate said mirror lens and concave mirror, said light being substantially in the focus of the reflecting surface of said mirror lens and the center of said concave mirror; and means whereby said concave mirror can be placed intermediate said source of light and said mirror lens, thereby forming a reflector for said source of light from the lamp and intercepting the rays to said mirror lens.

6. In a projecting lamp, a mirror lens having aparaboloidal reflecting surface; a

source of light substantially in the focus of said reflecting surface; a concave mirror facing said mirror'lens and adapted to reflect rays from said source of light on to said mirror lens; means for moving said concave mirror intermediate said source of light and said mirror lens whereby the concave mirror forms a reflector for said concave light by intercepting the rays from said mirror lens; and a diffuser adapted to intercept the rays from said concave mirror and source of light when the said concave mirror is positioned intermediate the light and the mirror lens.

7. In a projecting lamp, a reflector, a second reflector facing the first, a source of light therebetween, a normally inoperative diffuser adapted to co-act with said second reflector, and means for moving the second reflector between the li ht and the first reflector whereby said difluser is rendered operative.

In. testimony whereof We have signed our names to this specification in the presence of two subscribing witnesses.

CABLE A. MATISSE. ALBERT G. MATISSE.

Witnesses:

JOSEPH A. BRUNO, CLIFFORD C. WIGG. 

